| Title | Bacterial diversity and microbial functional responses to organic matter composition and persistent organic pollutants in deltaic lagoon sediments |
| Abstract | Lagoons in river deltas are highly productive systems that receive high loads of organic matter and nutrients. Among the major environmental stress factors and human health-related issues, the anthropogenic contamination is of particular concern, since coastal lagoons are intensively exploited for aquaculture activities. Although microbial communities constitute the most abundant fraction of the benthic biomass, also providing valuable ecosystem services, the links between sediment quality and microbial processes were largely disregarded. In this study, we aimed to elucidate whether different levels of riverine influence could provide favourable or adverse environmental conditions to sustain microbial diversity and processes. Sediments collected from four lagoons of the Po River delta were analysed to assess biochemical composition (biopolymeric carbon, Bio-PC), target organic pollutants (polycyclic aromatic hydrocarbons, PAHs; nonylphenols; bisphenol A), and microbial community properties (bacterial community composition, prokaryotic biomass, prokaryotic carbon production rate, PCP, community respiration rates, CR, extracellular enzyme activities, EEAs). The major physical and chemical sediment properties allowed identifying two statistically distinct groups of sediments with relatively low (LI) and high (HI) riverine influence. HI sediments were characterised by higher Bio-PC and PAHs concentrations, along with relatively high PAHs potential toxicity estimated by the Toxic Equivalent concentration approach. Contrasting results were obtained by linking the occurrence of dominant bacterial taxa (i.e., Desulfobulbaceae and Desulfobacteraceae) to sediment contamination patterns. Notably, the increasing pollution levels were likely to positively affect the occurrence of the family SVA1033, whereas detrimental effects were found against the family Ectothiorhodospiraceae. In addition, the concurrent increase of PCP/CR ratio along with key EEAs, highlighted that the benthic microbial community could consistently contribute to accelerate the degradation of persistent organic pollutants, with potential implication on the sediment self-purification processes. |
| Source | Estuarine, coastal and shelf science (Print) 233 |
| Keywords | Polycyclic Aromatic HydrocarbonsNonylphenolsBisphenol AMicrobial diversityMicrobial processesC-flux |
| Journal | Estuarine, coastal and shelf science (Print) |
| Editor | Academic Press in association with the Estuarine and Brackish-water Sciences Association,, New York, Stati Uniti d'America |
| Year | 2019 |
| Type | Articolo in rivista |
| DOI | 10.1016/j.ecss.2019.106508 |
| Authors | Zoppini A., Bongiorni L., Ademollo N., Patrolecco L., Cibic T., Franzo A., Melita M., Bazzaro M., Amalfitano S. |
| Text | 413068 2019 10.1016/j.ecss.2019.106508 Scopus 2 s2.0 85076842262 ISI Web of Science WOS WOS 000515445400011 Polycyclic Aromatic Hydrocarbons Nonylphenols Bisphenol A Microbial diversity Microbial processes C flux Bacterial diversity and microbial functional responses to organic matter composition and persistent organic pollutants in deltaic lagoon sediments Zoppini A., Bongiorni L., Ademollo N., Patrolecco L., Cibic T., Franzo A., Melita M., Bazzaro M., Amalfitano S. IRSA CNR, ISMAR CNR, IRSA CNR, IRSA CNR, OGS, OGS, IRSA CNR, OGS, IRSA CNR Lagoons in river deltas are highly productive systems that receive high loads of organic matter and nutrients. Among the major environmental stress factors and human health related issues, the anthropogenic contamination is of particular concern, since coastal lagoons are intensively exploited for aquaculture activities. Although microbial communities constitute the most abundant fraction of the benthic biomass, also providing valuable ecosystem services, the links between sediment quality and microbial processes were largely disregarded. In this study, we aimed to elucidate whether different levels of riverine influence could provide favourable or adverse environmental conditions to sustain microbial diversity and processes. Sediments collected from four lagoons of the Po River delta were analysed to assess biochemical composition biopolymeric carbon, Bio PC , target organic pollutants polycyclic aromatic hydrocarbons, PAHs; nonylphenols; bisphenol A , and microbial community properties bacterial community composition, prokaryotic biomass, prokaryotic carbon production rate, PCP, community respiration rates, CR, extracellular enzyme activities, EEAs . The major physical and chemical sediment properties allowed identifying two statistically distinct groups of sediments with relatively low LI and high HI riverine influence. HI sediments were characterised by higher Bio PC and PAHs concentrations, along with relatively high PAHs potential toxicity estimated by the Toxic Equivalent concentration approach. Contrasting results were obtained by linking the occurrence of dominant bacterial taxa i.e., Desulfobulbaceae and Desulfobacteraceae to sediment contamination patterns. Notably, the increasing pollution levels were likely to positively affect the occurrence of the family SVA1033, whereas detrimental effects were found against the family Ectothiorhodospiraceae. In addition, the concurrent increase of PCP/CR ratio along with key EEAs, highlighted that the benthic microbial community could consistently contribute to accelerate the degradation of persistent organic pollutants, with potential implication on the sediment self purification processes. 233 Preprint https //www.sciencedirect.com/science/article/pii/S0272771419307462 29/11/2019 L attivita sperimentale descritta nell articolo e stata finaziata dal progetto Bandiera RITMARE, LA RICERCA ITALIANA PER IL MARE SP3 WP2 AZ1 U006 C flow and microbial communities in coastal areas at high anthropogenic impact Bacterial diversity and microbial functional responses to organic matter composition and persistent organic pollutants in deltaic lagoon sediments REPRINT Zoppini et al. ECSS_20.pdf Articolo in rivista Academic Press in association with the Estuarine and Brackish water Sciences Association, 0272 7714 Estuarine, coastal and shelf science Print Estuarine, coastal and shelf science Print Estuar., coast. shelf sci. Print Estuarine, coastal and shelf science. Print marcomelita MELITA MARCO luisa.patrolecco PATROLECCO LUISA stefano.amalfitano AMALFITANO STEFANO lucia.bongiorni BONGIORNI LUCIA nicoletta.ademollo ADEMOLLO NICOLETTA annamaria.zoppini ZOPPINI ANNAMARIA TA.P04.032.002 Ruolo delle comunita microbiche nei cicli biogeochimici e nella degradazione degli inquinanti DTA.AD002.479.001 Gestione sostenibile ed efficiente delle risorse naturali, degli ecosistemi e della biodiversita |
